Beschreibung:
Phytoextraction is a cost-effective and ecofriendly technology to remove As from contaminated soil using plants and associated microorganisms. Pteris vittata is the most studied As hyperaccumulator, which effectively takes up inorganic arsenate via roots. Arsenic solubilization and speciation occurs prior to plant absorption in the rhizosphere, which plays a key role in As phytoextraction by P. vittata. This study investigated the metabolomic correlation of P. vittata and associated rhizospheric microorganisms during As phytoextraction. Three-months pot cultivation of P. vittata in As polluted soil was conducted. In rhizosphere, an increase of water-soluble As concentration and a decrease of pH was observed in the second month, suggesting acidic metabolites as possible cause of As solubilization. A correlation network was built to elucidate the interactions among metabolites, bacteria and fungi in the rhizosphere of P. vittata. Our results demonstrate that the plant is the major driving force of rhizosphere microbiota generation, and both microbial community and metabolites in rhizosphere of P. vittata correlate to increase bioavailable As. Multi-omics analysis revealed that pterosin enrich microbes that potentially promote As phytoextraction. This study extends the current view of rhizospheric plant-microbes synergistic effects of hyperaccumulators on phytoextraction, which provides clues for developing efficient As phytoremediation approaches